one problem i have with Batman is why did he not know about Ysalamiri i would have throught the great detective would have done his research a bit better and found them before taking on Vader
Well theres tomany things going on in the SW galaxy, what I mean by that is there so much information, not private, hiden, lost, for every aspect of living in the SW Galaxy / Universe, a place he isnt even from I might add, that there littile chance he could learn something about Ysalamiri.
Also there is a problem with Ysalamiri. 1) They use the Force to make a anti-force field. If the user has faith in there abilities through training they can defeat the Ysalamiris force ability. 2) If the user isnt trained well enough to deal with Ysalamiri they can always rip chunks of metal or, other heavy objects, and crush the Ysalamiri and the enemy holding it.